A Novel EST with Trench Electrode to Immunize Snab-back Effect and to Obtain High Blocking Voltage

Abstract

A vertical trench electrode type EST has been proposed in this paper. The proposed device considerably improves snapback which leads to a lot of problems of device applications. In this paper, the vertical dual gate Emitter Switched Thyristor (EST) with trench electrode has been proposed for improving snab-back effect. It is observed that the forward blocking voltage of the proposed device is 745V. The conventional EST of the same size were no more than 633V. Because the proposed device was constructed of trench-type electrodes, the electric field moved toward trench-oxide layer, and the punch through breakdown of the proposed EST is occurred at latest.

Keywords

• Trench Electrode;
• Latch-up;
• Snab-back;
• on-state voltage drop;
• Forward Blocking Voltage